diff options
Diffstat (limited to 'x86_64/isel.c')
| -rw-r--r-- | x86_64/isel.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/x86_64/isel.c b/x86_64/isel.c index a3c1c79..d69f9ad 100644 --- a/x86_64/isel.c +++ b/x86_64/isel.c @@ -516,9 +516,17 @@ sel(struct function *fn, struct instr *ins, struct block *blk, int *curi) ins->op = Oextu32; } else assert(!"nyi flt -> u64"); break; + case Oextu32: + if (ins->l.t == RTMP && insrescls(instrtab[ins->l.i]) == KI32 && instrtab[ins->l.i].op != Ocopy) { + /* no need to explicitly zero extend 32 -> 64bit regs in x86-64 */ + /* this copy can be optimized away in regalloc */ + ins->op = op = Ocopy; + ins->cls = KI32; + } + /* fallthru */ case Ocvtf32f64: case Ocvtf64f32: case Ocvtf32s: case Ocvtf64s: case Ocvts32f: case Ocvts64f: case Ocvtu64f: - case Oexts8: case Oextu8: case Oexts16: case Oextu16: case Oexts32: case Oextu32: + case Oexts8: case Oextu8: case Oexts16: case Oextu16: case Oexts32: if (isnumcon(ins->l)) { union ref it; bool ok = foldunop(&it, ins->op, ins->cls, ins->l); |